Bottom-dump tripping device.



G. E. STROM.

BOTTOM DUMP TRlPPlN-G DEVICE `APPLmATmN FILED ocT. l. |915.

1,302,876. Patented May 6, 1919.

y UNITED STATES klwfm OFFICE' GUSTAF E. STRUM, 0F ST. ]?AUL, MINNESOTA, ASSIGNOR TO AMERICAN HOIST & DERRICK i COWOF ST. IPAUL, MINNESOTA, APARTNERSI-IIP.

BOTTOM-DUMP TRIPPING DEVICE.

Specification ofLetters Patent.

Patented May 6, 1919.

Application led ctober 1, 1915. Serial No. 53,558.

To all whom t may concern." v

Be it known that I, GUsTAF E. STROM. citizen of the United States, resident of St. Paul, county of Ramsey, State of Minne sota, have invented certain new and useful Improvements in Bottom-Dump Tripping Devices, of which the following is a specication.

. The object of my invention is to provide a tripping device for the bottom dump of an excavating dipper of such construction that the trip line can be utilized for pulling the dipper backwardly toward the heel of the boom when the dipper arm is in a substantially vertical position, and when the arm is in a substantially horizontal position, the trip line will become effective to release the latch and dump the contents of the dipper.

Other objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

Figure 1 is an elevation of an excavating machine and boom, showing the application of my invention thereto,

Fig. 2 is a detail sectional view of the trip device by which the dumping of the dipper is controlled.

In the drawing, 2 represents an excavating machine, having a boom 3, a dipper 4, and a supporting arm 5. 6 represents the hinged vbottom of the dipper, normally secured by a locking latch 7. This bottom is hinged at 8 in theordinary way and when released will drop down to allow the contents of the dipper to be discharged. 9 is a casting, secured to the arm 5 by suitable means, such as bolts 10, provided with a recess 11 in which a swinging link 12 is pivoted at 13. This link has a socket 14 in one edge to receive a head 15 on a follower plate 16 that is mounted to move in a barrel 17 and is normally projected against the edge of the link by a helical spring 18. An adjusting screw 19 is provided for regulating the tension of this spring. A chain 20 1s connected with the free end of the link 12 and extends to the latch 7 and a trip line 21 is also connected to said link and extends to some suitable operating means of the eX- cavating machine. When the dipper is in the position substantially as shown in Fig. l, a pull on the trip line will disengage the locking latch, release the bottom of the dipper and allow the contents to be dumped.

Should the dipper arm be substantially vertical, a position it would normally assume by gravity when the lifting cable is slackened, the link 12 would then be substantially horizontal and an inward pull of the trip line would be exerted in a direction lengthwise of the link and cause the dipper .sion of the spring` 18, the tension of the spring will return the link to its normal poJ sition, allowing the locking latch to automatically return to its normal position and lock the bottom of the dipper when it is closed.

In various ways the details of construction herein shown and described may be modified without departing from the spirit of my invention.

I claim as my invention:

1. A device of the class described comprising a casting having means for attaching it to a dipper arm, a linlrpivoted at one end in said casting and having freedom of oscillation therein in a vertical plane, flexible means connecting said link with the latch to be tripped, a trip line also connected with said link for oscillating it, and a spring mounted to resist the movement of said link through the pull on said trip line.

2. A trip device for an excavating apparatus dipper comprising a casting having means for mounting it on a dipper arm and provided with a barrel and a compression spring therein, a link pivoted at one end within said casting and bearing on said spring, means connecting said link with the latch to be tripped and a trip line connected With said link for swinging it to trip said latch ag'gteinstA the tension of sgti'd"sprii`1g-,y

3. device of the class' describedM4 c`01n' prising a support having means for securingit'k t0" a dipper `erm', alinkpivoted-v at one' end Within said support and free to osc'll late therein, means connecting the other end of said link With the latch to be tripped, :L trip line connected with said link and :L spring? dviceinbunted to resist the lnoveln'ent.' f" seid link through' the pull-` on said trp line:

i'r` witness whereof?,- I` have hereunto` set mylhdzthis' 25th day? of September, 1915. 15

GUSTAF E. STROM.

Copies of this patent may be obtained for ve cents-each; by addressing the Commissioner of Patents, washington, m0. 

